Abstract

Relighting is an important technique in photography which enables the optical properties of a picture to be modified without retaking it again. However, different from an optical image, a digital hologram cannot be relit by simply varying the value of individual pixel, as each of them is representing holistic information of the entire object scene. In this paper, we propose a fast method for the relighting of a digital hologram. First, the latter is projected to a virtual wavefront recording plane (WRP) that is located close to the object scene. Next, the WRP is relit, and subsequently expanded into a full hologram. Experiment results have demonstrated that our proposed method is capable of relighting a 2048x2048 hologram at a rate of over 50 frames per second. To the best of our knowledge, this is the first time relighting is considered in the context of holography.

© 2012 OSA

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References

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2011

2010

2009

2007

T. Yamaguchi, G. Okabe, and H. Yoshikawa, “Real-time image plane full-color and full-parallax holographic video display system,” Opt. Eng.46(12), 125801 (2007).
[CrossRef]

Cheung, K. W. K.

Cheung, W. K.

Cheung, W.-K.

Denis, L.

Fournier, C.

Ito, T.

Kim, E. S.

Kim, S. C.

Kim, T.

Kim, Y. S.

Lam, E. Y.

Liu, J.-P.

Lorenz, D.

Masuda, N.

Nakayama, H.

Okabe, G.

T. Yamaguchi, G. Okabe, and H. Yoshikawa, “Real-time image plane full-color and full-parallax holographic video display system,” Opt. Eng.46(12), 125801 (2007).
[CrossRef]

Poon, T.-C.

Sakamoto, Y.

Sakata, H.

Shimobaba, T.

Thiébaut, E.

Trede, D.

Tsang, P.

Tsang, P. W. M.

Yamaguchi, T.

T. Yamaguchi, G. Okabe, and H. Yoshikawa, “Real-time image plane full-color and full-parallax holographic video display system,” Opt. Eng.46(12), 125801 (2007).
[CrossRef]

Yoshikawa, H.

T. Yamaguchi, G. Okabe, and H. Yoshikawa, “Real-time image plane full-color and full-parallax holographic video display system,” Opt. Eng.46(12), 125801 (2007).
[CrossRef]

Zhang, X.

Zhou, C.

Appl. Opt.

J. Opt. Soc. Am. A

Opt. Eng.

T. Yamaguchi, G. Okabe, and H. Yoshikawa, “Real-time image plane full-color and full-parallax holographic video display system,” Opt. Eng.46(12), 125801 (2007).
[CrossRef]

Opt. Express

Opt. Lett.

Other

T.-C. Poon, ed., Digital holography and three-dimensional display: Principles and Applications (Springer, 2006).

Supplementary Material (1)

» Media 1: AVI (2435 KB)     

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Figures (6)

Fig. 1
Fig. 1

Spatial relation between the object point, the WRP, and the hologram.

Fig. 2
Fig. 2

Relighting image simulating a spotlight effect.

Fig. 3
Fig. 3

(a) Scene image evenly divided into a left and a right sections, positioned at 0.55m and 0.6m from the hologram plane, respectively. (b) Relighting image simulating the directional illumination emerging from the upper right corner. (c),(d) Numerical reconstructed image of the digital hologram representing the image in Fig. 3(a), at a distance of 0.55m and 0.6m, respectively.

Fig. 4
Fig. 4

Numerical reconstructed image of the digital hologram that has been directly relit with the image in Fig. 3(b), at a focal distance of 0.55m and 0.6m, respectively.

Fig. 5
Fig. 5

Numerical reconstructed image of the digital hologram (relit with our proposed method based on the relighting image in Fig. 3(b) representing the image in Fig. 3(a), at a focal distance of 0.55m and 0.6m, respectively.

Fig. 6
Fig. 6

(a) Hemisphere rendered with the texture of the earth image. (b) Optical reconstructed image of the hologram representing the hemisphere shown in (a). (c) Single frame excerpt of the optical reconstructed image of the hologram representing the hemisphere in (a), which has been relit with the spotlight image shown in Fig. 2.

Equations (8)

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u w ( x , y ) = j = 0 N 1 a j R w j exp ( i 2 π λ R w j ) ,
u w ( x , y ) = j = 0 N 1 F j ,
u ( x , y ) = K F - 1 [ F [ u w ( x , y ) ] F [ h ( x , y ) ] ] ,
u w ( x , y ) = 1 K F - 1 [ F [ u ( x , y ) ] F [ h ( x , y ) ] ]
u w L ( x , y ) = G ( x , y ) u w ( x , y )
u L ( x , y ) = K F - 1 [ F [ u w L ( x , y ) ] F [ h ( x , y ) ] ]
u D L ( x , y ) = u ( x , y ) G ( x , y ) .
H ( x , y ) = R E [ u ( x , y ) R ( y ) ] ,

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